S5 Active SM-G870A, can I get some root help?

First time poster, long time admirer. I'm having quite a bit of trouble trying to root my Galaxy S5 Active G870A. I consider myself technically literate - I'm a ham radio operator, I've built computers, I'm an engineering student at Purdue, and I have installed / modded OSs on PCs before - but I'm totally new to mobile phone modding.

Once long ago, I had my phone rooted with towelroot, but then it updated and I lost root and have not been able to get it back since. (I searched this forum, with no explicit luck) I've tried towelroot with no success, getting the error "phone not supported". My end goal is to install CM11 or another good bloatware-free and battery-saving ROM of anybody's recommendation.

First time poster, long time admirer. I'm having quite a bit of trouble trying to root my Galaxy S5 Active G870A. I consider myself technically literate - I'm a ham radio operator, I've built computers, I'm an engineering student at Purdue, and I have installed / modded OSs on PCs before - but I'm totally new to mobile phone modding.

Once long ago, I had my phone rooted with towelroot, but then it updated and I lost root and have not been able to get it back since. (I searched this forum, with no explicit luck) I've tried towelroot with no success, getting the error "phone not supported". My end goal is to install CM11 or another good bloatware-free and battery-saving ROM of anybody's recommendation.

Please take the time to read the whole thread through, carefully and thoroughly, before embarking on rooting. If you have any further questions, you can either post in that thread or the forum on here, that is dedicated to all things root, Samsung Galaxy S5 Rooting, ROMs & Hacks

Thank you so much! This worked perfect on the first try. I Just got back from school and took 10 minutes to give it a go. For anybody else who finds this thread, here is a good writeup on how to use Odin: *this forum won't let me post links. Will post it later*

Now, it appears that there is no CM for the S5 Active. Do you all have any good ROM recommendations?